Two methods of 3-D scattering center extraction for targets with micro-motion

Aiming at the problem of three-dimensional scattering center extraction based on high resolution range profile (HRRP) sequence, two methods based on projection equation solving and spherical fitting were presented in this paper. Equation solving method was to solve the matrix equation based on the algebraic relations between the 1-D radial distance and 3-D position. Spherical fitting method was to extract scattering centers from the mapping graph according to the spherical distribution of 1-D projection data. In addition, a way of turning precession parameters into angle parameters indirectly was proposed for the difficulty of getting the look angle of the radar, Two methods were all verified by experiments developed with simulated and measured data. Finally, the features and performance of two methods were compared in the paper. The result indicates that the spherical fitting method is better than the equation solving method by 15dB under the same SNR.